Simplify by combing the like terms:
a) 6x2 + 9y2 + 2xy – 4x2 – 7y2 + 8xy
b) (y2 + 5y – 8) – (2y – 6y2 + 4)
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Answer:
a) 6x2 + 9y2 + 2xy - 4x2 - 7y2 + 8xy
=2x2+5y2+10xy
b) (y2 + 5y - 8 ) - (2y- 6y2 +4)
=34y3 + 62y2 - 9 - 32
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